- #1
CitronBleu
- 13
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Hello and thank you for allowing me to post a question.
I am not very familiar with systems engineering and have a question about the frame joints connecting the main body of the MSL (Mars Science Laboratory) powered descent stage with its 8 Aerojet MR-80B 800 lbs thrusters (1).
I am not sure what the spacecraft chassis or joints are made of.
The descent stage weighs 2,400 kg with an extra 390 Kg of propellant. The rover itself weighs 900 Kg. This comes out to a total of 3,600 Kg, or 3 1/2 tons (2). Gravity on Mars is 0.38 that of Earth (3). When the powered descent engine starts, the Sky Crane and rover are both plunging towards the Martian surface at breakneck velocity 125 m/s (4).
What type of forces are acting upon these frame joints when the descent vehicle separates from the back shell and the thrusters are at full throttle? Are they solid enough to maintain their structural integrity under such forces?(1) http://matthewwturner.com/uah/IPT20...iles/Payload/Downloads/AIAA-2007-5481-979.pdf
(2) http://en.wikipedia.org/wiki/Mars_Science_Laboratory
(3) http://en.wikipedia.org/wiki/Mars
(4) http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/41629/1/10-1775.pdf
I am not very familiar with systems engineering and have a question about the frame joints connecting the main body of the MSL (Mars Science Laboratory) powered descent stage with its 8 Aerojet MR-80B 800 lbs thrusters (1).
I am not sure what the spacecraft chassis or joints are made of.
The descent stage weighs 2,400 kg with an extra 390 Kg of propellant. The rover itself weighs 900 Kg. This comes out to a total of 3,600 Kg, or 3 1/2 tons (2). Gravity on Mars is 0.38 that of Earth (3). When the powered descent engine starts, the Sky Crane and rover are both plunging towards the Martian surface at breakneck velocity 125 m/s (4).
What type of forces are acting upon these frame joints when the descent vehicle separates from the back shell and the thrusters are at full throttle? Are they solid enough to maintain their structural integrity under such forces?(1) http://matthewwturner.com/uah/IPT20...iles/Payload/Downloads/AIAA-2007-5481-979.pdf
(2) http://en.wikipedia.org/wiki/Mars_Science_Laboratory
(3) http://en.wikipedia.org/wiki/Mars
(4) http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/41629/1/10-1775.pdf
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